<template>
  <!-- :default-active="activeMenu" -->
  <!--  -->
  <el-menu
    :default-active="activeMenu"
    mode="horizontal"
    @select="handleSelect"
  >
    <template v-for="(item, index) in topMenus">
      <!-- <el-menu-item
        :style="{ '--theme': theme }"
        :index="item.path"
        :key="index"
        v-if="index < visibleNumber"
        ><svg-icon :icon-class="item.meta.icon" />
        {{ item.meta.title }}
      </el-menu-item> -->
      <el-popover
        popper-class="custom-popper"
        placement="bottom"
        width="300"
        v-model="item.visible"
      >
        <div style="display: flex; flex-wrap: wrap">
          <div
            @click="handleSelectTop(itemMenu.path, item.children, item)"
            v-for="itemMenu in item.children"
            class="childer-menu"
          >
            <svg-icon
              style="margin-left: 2px"
              :icon-class="itemMenu.meta.icon"
            />
            <div style="margin-left: 5px">{{ itemMenu.meta.title }}</div>
          </div>
        </div>
        <div
          @click="current = index"
          :style="{ '--theme': theme }"
          slot="reference"
          v-if="index < visibleNumber"
          style="display: flex"
          class="menu-item"
          :class="{ 'memu-item-current': current == index }"
        >
          <svg-icon :icon-class="item.meta.icon" />
          <div style="margin-left: 5px">{{ item.meta.title }}</div>
        </div>
      </el-popover>
    </template>

    <!-- 顶部菜单超出数量折叠 -->
    <el-submenu
      :style="{ '--theme': theme }"
      index="more"
      v-if="topMenus.length > visibleNumber"
    >
      <template slot="title">更多菜单</template>
      <template v-for="(item, index) in topMenus">
        <el-menu-item
          :index="item.path"
          :key="index"
          v-if="index >= visibleNumber"
          ><svg-icon :icon-class="item.meta.icon" />
          {{ item.meta.title }}</el-menu-item
        >
      </template>
    </el-submenu>
  </el-menu>
</template>

<script>
import { constantRoutes } from "@/router";

// 隐藏侧边栏路由
const hideList = ["/index", "/user/profile"];

export default {
  data() {
    return {
      // 顶部栏初始数
      visibleNumber: 5,
      // 当前激活菜单的 index
      currentIndex: undefined,
      current: "",
    };
  },
  computed: {
    theme() {
      return this.$store.state.settings.theme;
    },
    // 顶部显示菜单
    topMenus() {
      let topMenus = [];
      this.routers.map((menu) => {
        if (menu.hidden !== true) {
          // 兼容顶部栏一级菜单内部跳转
          if (menu.path === "/") {
            topMenus.push(menu.children[0]);
          } else {
            topMenus.push(menu);
          }
        }
      });
      console.log(topMenus, "topMenus");
      return topMenus;
    },
    // 所有的路由信息
    routers() {
      return this.$store.state.permission.topbarRouters;
    },
    // 设置子路由
    childrenMenus() {
      var childrenMenus = [];
      this.routers.map((router) => {
        for (var item in router.children) {
          if (router.children[item].parentPath === undefined) {
            if (router.path === "/") {
              router.children[item].path = "/" + router.children[item].path;
            } else {
              if (!this.ishttp(router.children[item].path)) {
                router.children[item].path =
                  router.path + "/" + router.children[item].path;
              }
            }
            router.children[item].parentPath = router.path;
          }
          for (var item2 in router.children[item].children) {
            if (
              router.children[item].children[item2].parentPath === undefined
            ) {
              if (router.path === "/") {
                router.children[item].children[item2].path =
                  "/" + router.children[item].children[item2].path;
              } else {
                if (!this.ishttp(router.children[item].children[item2].path)) {
                  router.children[item].children[item2].path =
                    router.children[item].path +
                    "/" +
                    router.children[item].children[item2].path;
                  console.log(router.children[item].children[item2].path);
                }
              }
              router.children[item].children[item2].parentPath =
                router.children[item].path;
            }
          }

          childrenMenus.push(router.children[item]);
        }
      });
      return constantRoutes.concat(childrenMenus);
    },

    // 默认激活的菜单
    activeMenu() {
      const path = this.$route.path;
      let activePath = path;
      console.log(this.routers);
      if (
        path !== undefined &&
        path.lastIndexOf("/") > 0 &&
        hideList.indexOf(path) === -1
      ) {
        const tmpPath = path.substring(1, path.length);
        activePath = this.extractSubstring(tmpPath);
        activePath = "/" + activePath;
        if (!this.$route.meta.link) {
          this.$store.dispatch("app/toggleSideBarHide", false);
        }
      } else if (!this.$route.children) {
        activePath = path;
        this.$store.dispatch("app/toggleSideBarHide", true);
      }
      this.activeRoutesTop(activePath);
      return activePath;
    },
  },
  beforeMount() {
    window.addEventListener("resize", this.setVisibleNumber);
  },
  beforeDestroy() {
    window.removeEventListener("resize", this.setVisibleNumber);
  },
  mounted() {
    this.setVisibleNumber();
  },
  methods: {
    extractSubstring(inputString) {
      const firstSlashIndex = inputString.indexOf("/");
      const secondSlashIndex = inputString.indexOf("/", firstSlashIndex + 1);

      if (firstSlashIndex !== -1 && secondSlashIndex !== -1) {
        return inputString.substring(0, secondSlashIndex);
      } else {
        return inputString;
      }
    },

    childrenMenusTop(e) {
      var childrenMenus = [];
      e.map((router) => {
        for (var item in router.children) {
          if (router.children[item].parentPath === undefined) {
            if (router.path === "/") {
              router.children[item].path = "/" + router.children[item].path;
            } else {
              if (!this.ishttp(router.children[item].path)) {
                router.children[item].path =
                  router.path + "/" + router.children[item].path;
              }
            }
            router.children[item].parentPath = router.path;
          }
          childrenMenus.push(router.children[item]);
        }
      });
      return constantRoutes.concat(childrenMenus);
    },
    // 根据宽度计算设置显示栏数
    setVisibleNumber() {
      const width = document.body.getBoundingClientRect().width / 3;
      this.visibleNumber = parseInt(width / 85);
    },
    // 菜单选择事件
    handleSelect(key, keyPath) {
      this.currentIndex = key;
      const route = this.routers.find((item) => item.path === key);
      if (this.ishttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        this.$router.push({ path: key });
        this.$store.dispatch("app/toggleSideBarHide", true);
      } else {
        // 显示左侧联动菜单
        this.activeRoutes(key);
        this.$store.dispatch("app/toggleSideBarHide", false);
      }
    },
    // 菜单选择事件
    handleSelectTop(key, itemList, item) {
      item.visible = false;
      // this.currentIndex = key;
      const route = itemList.find((item) => item.path === key);

      if (this.ishttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, "_blank");
      } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        this.$router.push({ path: key });
        this.$store.dispatch("app/toggleSideBarHide", true);
      } else {
        // 显示左侧联动菜单
        this.activeRoutesTop(key, itemList);
        this.$store.dispatch("app/toggleSideBarHide", false);
      }
    },
    activeRoutesTop(key, itemList) {
      console.log(key, "key");
      var routes = [];
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.forEach((item) => {
          console.log(item.parentPath);
          item.children &&
            item.children.forEach((item2) => {
              if (
                key == item2.parentPath ||
                (key == "index" && "" == item2.path)
              ) {
                routes.push(item2);
              }
            });
        });
      }
      if (routes.length > 0) {
        this.$store.commit("SET_SIDEBAR_ROUTERS", routes);
      } else {
        this.$store.dispatch("app/toggleSideBarHide", true);
      }
    },
    // 当前激活的路由
    activeRoutes(key) {
      var routes = [];
      if (this.childrenMenus && this.childrenMenus.length > 0) {
        this.childrenMenus.map((item) => {
          if (key == item.parentPath || (key == "index" && "" == item.path)) {
            routes.push(item);
          }
        });
      }
      if (routes.length > 0) {
        this.$store.commit("SET_SIDEBAR_ROUTERS", routes);
      } else {
        this.$store.dispatch("app/toggleSideBarHide", true);
      }
    },
    ishttp(url) {
      return url.indexOf("http://") !== -1 || url.indexOf("https://") !== -1;
    },
  },
};
</script>

<style lang="scss">
.custom-popper {
  padding-bottom: 0 !important;
}
.topmenu-container.el-menu--horizontal > .el-menu-item {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal > .el-menu-item.is-active,
.el-menu--horizontal > .el-submenu.is-active .el-submenu__title {
  border-bottom: 2px solid #{"var(--theme)"} !important;
  color: #303133;
}

/* submenu item */
.topmenu-container.el-menu--horizontal > .el-submenu .el-submenu__title {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
}
.menu-item {
  float: left;
  height: 50px !important;
  line-height: 50px !important;
  color: #999093 !important;
  padding: 0 5px !important;
  margin: 0 10px !important;
  font-size: 14px;
  align-items: center;
  cursor: pointer;
}
.memu-item-current {
  border-bottom: 2px solid var(--theme);
  color: #303133;
}
.childer-menu {
  width: 33.33%;
  text-align: center;
  margin-bottom: 10px;
  font-size: 14px;
  cursor: pointer;
}
</style>
